at least on Windows 7, if CursorFX theme is turned on, then Adobe Flash internal dialogs are unusable
tried in Opera, MSIE x86, MSIE x64
see
I met it when was asked for help - flash was configured to ask for WebStorage and on YouTube asked if domain s.ytimg.com can save data locally - as a result no YouTube video could be watched!
Ticket ID: ZDG-930918